We are asked to calculate the area of five triangles labeled a, b, c, d, and e. All dimensions are in cm.

1. Problem Description

We are asked to calculate the area of five triangles labeled a, b, c, d, and e. All dimensions are in cm.

2. Solution Steps

The area of a triangle is given by the formula:

$Area = \frac{1}{2} \times base \times height$

a) The base is 8 cm and the height is 4 cm.

$Area_a = \frac{1}{2} \times 8 \times 4 = \frac{32}{2} = 16$ cm$^2$

b) The base is 8 cm and the height is 3 cm.

$Area_b = \frac{1}{2} \times 8 \times 3 = \frac{24}{2} = 12$ cm$^2$

c) The base is 7 cm and the height is 10 cm.

$Area_c = \frac{1}{2} \times 7 \times 10 = \frac{70}{2} = 35$ cm$^2$

d) The base is 1.8 cm and the height is 2 cm.

$Area_d = \frac{1}{2} \times 1.8 \times 2 = \frac{3.6}{2} = 1.8$ cm$^2$

e) The base is 5 cm and the height is 5 cm.

$Area_e = \frac{1}{2} \times 5 \times 5 = \frac{25}{2} = 12.5$ cm$^2$

3. Final Answer

Area of triangle a = 16 cm$^2$

Area of triangle b = 12 cm$^2$

Area of triangle c = 35 cm$^2$

Area of triangle d = 1.8 cm$^2$

Area of triangle e = 12.5 cm$^2$