A=1/2 BH
the area of a triangle is half of the basexheight.
If the base of a triangle is 10, and the height is 4, you would take half of either 10 or 4 (doesn't matter), and then times them together and you have the area.
EX: A=1/2 10x4
(Take half of ten)
A=5x4
A=20
NEVER take half of both numbers. Only 1!
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Area of a triangle = 0.5*base*perpendicular height
Trinagle
It depends on what information you do have.
Scalene Trinagle
1/2 x length x height 57.5x115 =6612.5 - 30x60 =1800 - = 4812.5 (48.125cm)