Helen's Blog

I'm going to show you how to do 9-2.\

Formulas that you can use:

• 1/2 bh only use this for a right triangle

• 1/2 bh sin(angle b/w) only use this formula for a non right triangle

Examples:

Two sides of a triangle have lengths 9cm & 3cm. The angle between the sides measure 64 degrees. find the area of the triangle.

Since there is no right angle you would use: (1/2 bh sin(angle b/w))

Then you would just plug the numbers in.
a=1/2 (9)(3) sin 64 degrees
a=13.5 sin 64 degrees
a=12.1337 cm squared

And that's all you have to do and if you have a triangle with a right angle you would just have to use 1/2 bh. ( This was the easiest thing I learned all week its not that hard as long as you know the formula).