14. Which of the following statements about an equilateral triangle is NOT true?A. It has 3 congruent sides.B. It has 3 congruent angles.C.It has 3 diagonals.D. It has 3 vertices.15. Which is the measure of each interior angle of a regular decagon?A. 144°B. 180°C. 156°D. 360°16. Which is the measure of an exterior angle of a regular octagon?A. 36°B. 45°C. 90°D. 180°17. How many sides does a polygon have if its interior angle measures add up to 6,120°?A. 14B. 25C. 36D. 4718. What is the measure of each interior angle of a regular 18-sided polygon?A. 22.5°B. 85°C. 157.5°D. 160°
Answer (1)
Answer:Here are the answers to your questions:14. C. It has 3 diagonals. An equilateral triangle does not have any diagonals.15. A. 144° Each interior angle of a regular decagon (10-sided polygon) is 144°.16. B. 45° Each exterior angle of a regular octagon (8-sided polygon) is 45°.17. B. 25 The polygon has 25 sides if the sum of its interior angles is 6,120°.18. C. 157.5° Each interior angle of a regular 18-sided polygon is 157.5°.
