Area Of A Triangle Flashcards
1
Q
How do we normally work out the area of a triangle?
A
We normally work out the area of a triangle as shown:
A = 1/2bh
2
Q
When do we use trig to help find the area of a triangle? What do we need in order to use trig to help find the area of a triangle?
A
We use trig to help find the area of a triangle when the perpendicular height is not known. To do this we need to know 2 sides and the angle included between them.
3
Q
What formula do we use for the area of a triangle when the perpendicular height is not known?
A
The formula we use for the area of a triangle when the perpendicular height is not known is:
A = 1/2absinC
(Formula sheet)
Remember we need to know 2 sides and the angle included between them.
