Answer:
h=6
Step-by-step explanation:
A=(1/2)bh
b= base
h= height
A= area
21=(1/2)7h
h=21/3.5
6
Area of a triangle =1/2*base * height
21=1/2*7*h
21=7/2 h
cross multiply
7h=21*2
7h=42
h=42/7
