Question
One of the equal angles of an isosceles triangle is 55 degrees. If the base is 20 cm, what is the perimeter and the area?
Answers
Reiny
So the other angle must be 180-2(55) or 70°
draw in the height, h
You now have a right-angled triangle, let the hypotenuse be x
you can find the height by
tan 55° = h/10
you can find the side by
cos 55° = 10/x
once you have x, you can find the perimeter.
once you have h, you can find the area by
area = (1/2)(20)(h)
draw in the height, h
You now have a right-angled triangle, let the hypotenuse be x
you can find the height by
tan 55° = h/10
you can find the side by
cos 55° = 10/x
once you have x, you can find the perimeter.
once you have h, you can find the area by
area = (1/2)(20)(h)
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