Math Gr 8 Ch 13: Calculations and Solving Problems

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What is the formula for the perimeter of a square?

P = 2s

P = 3s

P = 4s (correct)

P = 5s

What is the formula for the area of a rectangle?

A = l × b (correct)

A = l / b

A = l + b

A = l - b

What is the formula for the circumference of a circle?

C = 4πr

C = 2πr (correct)

C = 3πr

C = πr

What is the formula for the area of a triangle?

A = 1/2 × base × height Signup and view all the answers

What is the distance around a shape measured in units such as mm, cm, m, and km?

Perimeter Signup and view all the answers

How do you find the area of a composite shape?

Break it down into simpler shapes, calculate their areas separately, and then sum them up Signup and view all the answers

What is the formula for the area of a circle?

A = πr^2 Signup and view all the answers

What is the diameter of a circle if its radius is 4cm?

8cm Signup and view all the answers

What is the perimeter of a square with a side length of 5cm?

20cm Signup and view all the answers

A rectangle has a length of 8cm and a breadth of 5cm. What is its perimeter?

26cm Signup and view all the answers

What is the area of a triangle with a base of 6cm and a height of 8cm?

24cm² Signup and view all the answers

A circle has a radius of 7cm. What is its circumference?

28πcm Signup and view all the answers

What is the area of a circle with a diameter of 14cm?

49πcm² Signup and view all the answers

A rectangle has a length of 10cm and a breadth of 6cm. What is its area?

60cm² Signup and view all the answers

A square has an area of 49cm². What is its side length?

7cm Signup and view all the answers

A triangle has a base of 10cm and a height of 12cm. What is its perimeter if the third side is 15cm?

37cm Signup and view all the answers

If a square has a side length of 9cm, what is its perimeter?

36cm Signup and view all the answers

A rectangle has a length of 12cm and a breadth of 7cm. What is its area?

84cm² Signup and view all the answers

If a circle has a circumference of 44cm, what is its radius?

7cm Signup and view all the answers

A triangle has a base of 8cm and a height of 12cm. What is its area?

48cm² Signup and view all the answers

If a rectangle has an area of 96cm² and a length of 12cm, what is its breadth?

8cm Signup and view all the answers

A circle has an area of 154cm². What is its diameter?

14cm Signup and view all the answers

If a triangle has a perimeter of 30cm and two sides of 10cm and 12cm, what is its third side?

8cm Signup and view all the answers

A rectangle has a length of 15cm and a breadth of 8cm. If a square is inscribed in it, what is the side length of the square?

8cm Signup and view all the answers

What is the perimeter of a rectangle with a length of 10cm and a breadth of 6cm, if the length is increased by 2cm and the breadth is increased by 3cm?

42cm Signup and view all the answers

A triangle has a base of 8cm and a height of 12cm. If the base is increased by 2cm and the height is increased by 3cm, what is its new area?

52cm² Signup and view all the answers

A circle has a radius of 7cm. If the radius is increased by 2cm, what is its new circumference?

48cm Signup and view all the answers

A square has a side length of 9cm. If the side length is increased by 1cm, what is its new perimeter?

40cm Signup and view all the answers

A rectangle has a length of 12cm and a breadth of 7cm. If the length is increased by 3cm and the breadth is decreased by 2cm, what is its new area?

84cm² Signup and view all the answers

A circle has a diameter of 14cm. If the diameter is increased by 4cm, what is its new area?

192cm² Signup and view all the answers

A triangle has a base of 10cm and a height of 12cm. If the base is increased by 2cm and the height is decreased by 2cm, what is its new perimeter?

36cm Signup and view all the answers

A rectangle has a length of 10cm and a breadth of 6cm. If the length is increased by 1cm and the breadth is increased by 1cm, what is its new perimeter?

34cm Signup and view all the answers

Math Gr 8 Ch 13: Calculations and Solving Problems

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Questions and Answers

What is the formula for the perimeter of a square?

What is the formula for the area of a rectangle?

What is the formula for the circumference of a circle?

What is the formula for the area of a triangle?

What is the distance around a shape measured in units such as mm, cm, m, and km?

How do you find the area of a composite shape?

What is the formula for the area of a circle?

What is the diameter of a circle if its radius is 4cm?

What is the perimeter of a square with a side length of 5cm?

A rectangle has a length of 8cm and a breadth of 5cm. What is its perimeter?

What is the area of a triangle with a base of 6cm and a height of 8cm?

A circle has a radius of 7cm. What is its circumference?

What is the area of a circle with a diameter of 14cm?

A rectangle has a length of 10cm and a breadth of 6cm. What is its area?

A square has an area of 49cm². What is its side length?

A triangle has a base of 10cm and a height of 12cm. What is its perimeter if the third side is 15cm?

If a square has a side length of 9cm, what is its perimeter?

A rectangle has a length of 12cm and a breadth of 7cm. What is its area?

If a circle has a circumference of 44cm, what is its radius?

A triangle has a base of 8cm and a height of 12cm. What is its area?

If a rectangle has an area of 96cm² and a length of 12cm, what is its breadth?

A circle has an area of 154cm². What is its diameter?

If a triangle has a perimeter of 30cm and two sides of 10cm and 12cm, what is its third side?

A rectangle has a length of 15cm and a breadth of 8cm. If a square is inscribed in it, what is the side length of the square?

What is the perimeter of a rectangle with a length of 10cm and a breadth of 6cm, if the length is increased by 2cm and the breadth is increased by 3cm?

A triangle has a base of 8cm and a height of 12cm. If the base is increased by 2cm and the height is increased by 3cm, what is its new area?

A circle has a radius of 7cm. If the radius is increased by 2cm, what is its new circumference?

A square has a side length of 9cm. If the side length is increased by 1cm, what is its new perimeter?

A rectangle has a length of 12cm and a breadth of 7cm. If the length is increased by 3cm and the breadth is decreased by 2cm, what is its new area?

A circle has a diameter of 14cm. If the diameter is increased by 4cm, what is its new area?

A triangle has a base of 10cm and a height of 12cm. If the base is increased by 2cm and the height is decreased by 2cm, what is its new perimeter?

A rectangle has a length of 10cm and a breadth of 6cm. If the length is increased by 1cm and the breadth is increased by 1cm, what is its new perimeter?

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