Topic 16: Area of a triangle
1. Find the area of triangle ABC with the given parts.
( a)
( b)
A = 320 , b =10 in, c = 5 in
a = 8 cm, b = 6 cm, c = 4 cm
2. What is the area of an equilateral triangle with sides of length 4 feet?
Answers
1.
2.
( a)
A=
( b)
s=
4 3 ft2
( 12 ) (10) ( 5) sin 300 =12.5 square inches
8 +6 +4
=9
2
A = 9 ( 9 − 8) ( 9 − 6 )( 9 − 4 ) = 135 square cm