Everything Maths Grade 10

SOLUTION

Step 1: Sketch the base triangle and calculate its area

4 cm

hb

8 cm

The height of the base triangle (hb) is:

82 = 4^2 +h^2 b

)hb=

√

82 42

= 4

p

3 cm

The area of the base triangle is:

area of base triangle=

1

2

bhb

=

1

2

 8  4

p

3

= 16

p

3 cm^2

Step 2: Sketch the side triangle and calculate pyramid heightH

4 cm

H

12 cm

Chapter 13. Measurements 443