Find the altitude of an isosceles triangle with base 10 and congruent sides of length 9.

Patty, please read the attached link.

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What does isosceles mean?
What does congruent mean?
Draw the triangle?
Draw a line for the height.
Find the eqn for the height from the picture.

hint: use pythagoras theorem

c^2 = a^2 + b^2

where c is the height