xalyssaniiicole
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- Apr 8, 2010
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The base of an isosceles triange is 70 centimeters long. The altitude to the base is 75 centimeters long. Find the measure of a base angle to the nearest degree.
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Isosceles Triangle, (I NEED HELP!)
- Thread starter xalyssaniiicole
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xalyssaniiicole
New member
- Joined
- Apr 8, 2010
- Messages
- 3
I started by drawing the triangle.
I have no idea what to do from here.
I have no idea what to do from here.
xalyssaniiicole said:I started by drawing the triangle.
I have no idea what to do from here.
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Welcome xalyssaniiicole : :
You know all the properties of an isosceles triangle,right !
An altitude drawn to the base of an isosceles triangle perp. bisects the base,correct !
So you'll get two perpendicular triangles . . .
tanA=opp/adj
tanA=(altitude)/(base/2)
On calculator : Shift tangent : You'll get the answer . . .
By the way, the two base angles are equal --> You can deduce the value of the third vertix.