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?

  • 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 = 4Ï€r
  • C = 2Ï€r (correct)
  • C = 3Ï€r
  • C = Ï€r

What is the formula for the area of a triangle?

<p>A = 1/2 × base × height (D)</p> Signup and view all the answers

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

<p>Perimeter (C)</p> Signup and view all the answers

How do you find the area of a composite shape?

<p>Break it down into simpler shapes, calculate their areas separately, and then sum them up (D)</p> Signup and view all the answers

What is the formula for the area of a circle?

<p>A = πr^2 (A)</p> Signup and view all the answers

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

<p>8cm (C)</p> Signup and view all the answers

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

<p>20cm (B)</p> Signup and view all the answers

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

<p>26cm (D)</p> Signup and view all the answers

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

<p>24cm² (B)</p> Signup and view all the answers

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

<p>28Ï€cm (A)</p> Signup and view all the answers

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

<p>49πcm² (D)</p> Signup and view all the answers

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

<p>60cm² (D)</p> Signup and view all the answers

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

<p>7cm (A)</p> 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?

<p>37cm (C)</p> Signup and view all the answers

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

<p>36cm (D)</p> Signup and view all the answers

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

<p>84cm² (D)</p> Signup and view all the answers

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

<p>7cm (D)</p> Signup and view all the answers

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

<p>48cm² (B)</p> Signup and view all the answers

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

<p>8cm (A)</p> Signup and view all the answers

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

<p>14cm (C)</p> 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?

<p>8cm (D)</p> 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?

<p>8cm (C)</p> 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?

<p>42cm (C)</p> 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?

<p>52cm² (D)</p> 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?

<p>48cm (B)</p> 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?

<p>40cm (C)</p> 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?

<p>84cm² (C)</p> 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?

<p>192cm² (A)</p> 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?

<p>36cm (B)</p> 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?

<p>34cm (A)</p> Signup and view all the answers

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