The way to find the area of a triangle is A=

if the base is 3 feet longer then the height we can write it like this B=H+3
now we can add it to our area equation
20=

20=

40=

+3H
10

=

h=3.2ft
Tenth: 243.9
hundreth: 243.88
ten: 240
hundred:200
hope this helps
Your answer is 60
a triangles angles add up to 180