Answer:
Calculate the surface area of the triangles no. 1, no. 1a and no. 2
Step-by-step explanation:
For example,
Given
Answer
Triangles no. 1 and no. 1a:
base = 3 cm
height = 2 cm
Formula:
A = 0.5 x base x height
= 0.5 x 3 cm x 2 cm = 3 cm2
Triangle no. 2:
base = 3 cm
height = 2 cm
A = 0.5 x 3 cm x 2 cm = 3 cm2
It can be seen that triangles no. 1, no. 1a and no. 2 have the same surface; the shapes of the triangles are different, but the base and the height are in all three cases the same, so the surface is the same.
The surface of these triangles is expressed in square centimetres (written as cm2). Surface areas can also be expressed in square decimetres (dm2), square metres (m2), etc...
QUESTION
Calculate the surface areas of the triangles nos. 3, 4, 5 and 6.
Given
Answer
Triangle no. 3:
base = 3 cm
height = 2 cm
Formula:
A = 0.5 x base x height
= 0.5 x 3 cm x 2 cm = 3 cm2
Triangle no. 4:
base = 4 cm
height = 1 cm
A = 0.5 x 4 cm x 1 cm = 2 cm2
Triangle no. 5:
base = 2 cm
height = 3 cm
A = 0.5 x 2 cm x 3 cm = 3 cm2
Triangle no. 6:
base = 4 cm
height = 3 cm
A = 0.5 x 4 cm x 3 cm = 6 cm2
