Question

Determine the area of a triangle with sides of the following length:

a = 19 m
b = 20 m
c = 21 m

Answer 1

Answer:C

Explanation:

Answer 2

C

Explanation:

The area of the triangle can be calculated using formula

`A=√(p(p-a)(p-b)(p-c)),`

where p is half of the perimeter.

1. If a=19, b=20 and c=21, then

`p=(a+b+c)/(2)=(19+20+21)/(2)=30\ m.`

2. The area is

`A=√(30\cdot (30-19)(30-20)(30-21))=√(30\cdot 11\cdot 10\cdot 9)=30√(33)\approx 172\ m^2.`