Consider a quadrilateral in which one interior angle is reflex (a concave quadrilateral). Three of the ordinary interior angles measure 50°, 40° and 70°. Using the angle sum of 360°, find the measure of the fourth (reflex) interior angle.

Question

Accepted Answer

200. Fourth angle = 360 - (50 + 40 + 70) = 360 - 160 = 200°, which is reflex (greater than 180).

Consider a quadrilateral in which one interior angle is reflex (a concave quadrilateral).
Three of the ordinary interior angles measure 50°, 40° and 70°.
Using the angle sum of 360°, find the measure of the fourth (reflex) interior angle.

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 9 Angle Sum Property of Quadrilaterals practice

Consider a quadrilateral in which one interior angle is reflex (a concave quadrilateral).Three of the ordinary interior angles measure 50°, 40° and 70°.Using the angle sum of 360°, find the measure of the fourth (reflex) interior angle.

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 9 Angle Sum Property of Quadrilaterals practice

Consider a quadrilateral in which one interior angle is reflex (a concave quadrilateral).
Three of the ordinary interior angles measure 50°, 40° and 70°.
Using the angle sum of 360°, find the measure of the fourth (reflex) interior angle.