# LESSON4- TRIANGLES

## CHOOSE THE PROPER WORD

**Base angles are CONGRUENT/SIMILAR.**

**The sum of the measures of any two SIDES/ANGLES in triangle is greater than the measure of the third SIDE/ANGLE.**

**The longest side of a triangle is ADJACENT/OPPOSITE to the largest angle.**

**A MEDIAN/ALTITUDE goes through a vertex of triangle and midpoint of the opposite side.**

## FILL IN THE GAPS

**Measures of the three exterior angles in triangle add up to .................... .**

**If two altitudes of triangle are congruent then the triangle is ................... .**

## LABEL TRUE OR FALSE

**All medians in triangle are concurrent. (T/F)**

**In triangle the angles opposite the congruent sides are congruent. (T/F)**

**Angle bisectors divide each other in the ratio 2 : 1. (T/F)**

**The measure of an exterior angle of a triangle is equal to the sum of the measures of the remote interior angles. (T/F)**

## Say, if the sentence is true always/ sometimes/ never.

**The acute angles of a right - angled triangle are complementary.**

**A triangle contains two obtuse angles.**

**The median to a side of triangle divides the triangle into two congruent triangles.**

**If the sides of a triangle are doubled, each angle of a new triangle is twice as large as the corresponding angle of the first triangle.**