Geometry, NAPX-H3-CA16 An isosceles triangle is drawn below. What is the size of the angle `angleABC`? `60°` `49.5°` `45°` `40.5°` Show Answers Only `40.5^@` Show Worked Solution `text(S)text(ince base angles are equal:)` `angleABC` `= 1/2 (180 - 99)` `= 1/2 xx 81` `= 40.5^@`