Learning Task #2 Write T in the blank if the statement is true and F if it is false, 1. If a building is a regular pentagon, the five outside walls as its sides are equal and five corners as its angles are equal in measure too. 2. Irregular polygons cannot be pentagons, hexagons and nonagons 3. A triangle with three congruent sides is called an isosceles triangle 4. The sum of the measures of the angles of a regular pentagon is 540" 5. Polygons with unequal sides and unequal angles are irregular polygons.