Practice with Isosceles Triangles Topic Index | Geometry Index | Regents Exam Prep Center
 Answer the following questions dealing with isosceles triangles.
 1 Find x: Choose one:  52 32 20

 2 If a triangle is equilateral, then it is isosceles. TRUE or FALSE? Choose one: TRUE FALSE

 3 Find the measure of <1:    (assume all segments are straight) Choose one:  32.5 50 65

 4 Find the measure of angle x:      (assume all segments are straight) Choose one:  56 68 112

 5 Find the measure of angle y. Choose one:  48 84 96

 6. If a triangle is isosceles, then it is also equilateral. TRUE or FALSE? Choose one: TRUE FALSE

Please note:  The answers shown for the following problems represent ONE possible solution.
Other solutions and methods of presentation are possible.

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 8 In ,  the vertices have coordinates A(0,-8), B(10,16), C(-24,2). Show whether this triangle is isosceles or not isosceles.

 9 Express AB in terms of r and t.  Is triangle ABC an isosceles triangle?

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 11 Prove:  The bisector of the vertex angle of an isosceles triangle is perpendicular to the base. Explanation

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