Perimeter, area and other shape stuff

Question 1

How do you find the area of a rectangle?

Answer 1

Multiply the length by the height
(Length x Height)

Question 2

How do you find the area of a triangle?

Answer 2

Half of the base multiplied by the height
(1/2Base x Height)

Question 3

How do you find the area of a trapeizium?

Answer 3

Half of the height multiplied by the sum of the length of its two parallel lines
(1/2Height x (a + b)

Question 4

How do you find the area of a parallelogram?

Answer 4

The base multiplied by the height
(Base x Height)

Question 5

How do you find the area of a circle?

Answer 5

Pi multiplied by the radius squared
(π x r^2)

Question 6

How do you find the perimeter of a shape?

Answer 6

Add together the sides

Question 7

How do you find the circumference of a circle (2 ways)

Answer 7

1. Pi multiplied by the diameter
   (π x D)
2. Pi multiplied by double the radius
   (π x (r x 2))

Question 8

How do you find the number of sides a shape has by the exterior angles?
(e.g: Each exterior angle of a regular polygon is 15°.

How many sides has the regular polygon?)

Answer 8

360 divided by the exterior angle
(360°÷n)

Question 9

How do you find the size of a shape’s exterior angles by the number of sides it has?
(e.g: Work out the size of an exterior angle of a regular polygon with 8 sides.)

Answer 9

Subtract the size of the interior angle from 180°
(180°-n)

Question 10

How do you find the area of a semi-circle?

Answer 10

Pi multiplied by radius squared divided by 2
(π × (r^2)/2)