IN MATH: 1. adj. in describing a triangle or trapezoid, one with two congruent sides. EX. Every equilateral triangle is isosceles.

ENGLISH: 1. as defined above.

APPLICATION: (see list 140)

1. An isosceles trapezoid has legs of 5 cm, an upper base of 10 cm, and a lower base of 16 cm. Its height is 4 cm. Find its perimeter, then its area.

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