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 = 4πr
  • C = 2πr (correct)
  • C = 3πr
  • C = πr

    • What is the formula for the area of a triangle?

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

    What is the formula for the area of a circle?

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

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

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

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

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

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

    <p>28πcm</p> Signup and view all the answers

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

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

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

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

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

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

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

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

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

    <p>14cm</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</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</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</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</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</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</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</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</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</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</p> Signup and view all the answers

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