ASSESSMENT: Read and understand each item, then choose the letter of your answer and write it on your answer sheet. 1. An angle formed by a side and an extension of an adjacent side of the regular polygon. a) Diagonal Angle c) Exterior Angle b) Interior Angle d) Right Angle 2. What is the sum of the interior angles of a triangle? a) $90^\circ$ c) $270^\circ$ b) $180^\circ$ d) $360^\circ$ 3. What is the sum of the interior angles of a regular octagon? a) $270^\circ$ c) $1080^\circ$ b) $900^\circ$ d) $1260^\circ$ 4. What is the measure of one interior angle of a regular decagon? a) $90^\circ$ c) $120^\circ$ b) $108^\circ$ d) $144^\circ$ 5. Find the measure of one interior angle of a regular polygon with 18 sides. a) 150 c) 170 b) 160 d) 180 6. What is the measure of one exterior angle of a regular octagon? a) $30^\circ$ c) $40^\circ$ b) $35^\circ$ d) $45^\circ$ 7. What is the measure of one exterior angle of a regular dodecagon? a) $30^\circ$ c) $40^\circ$ b) $35^\circ$ d) $45^\circ$ 8. The sum of the exterior angles of a regular decagon is a) $180^\circ$ c) $360^\circ$ b) $270^\circ$ d) $450^\circ$ 9. Find the measure of one interior angle of a regular 12-gon. a) 100 c) 130 b) 120 d) 150 10. If the sum of the interior angles of a polygon is 2340, then the measure of one exterior angle is a) 240 c) 280
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Step 1: An angle formed by a side and an extension of an adjacent side is the definition of an exterior angle, so the answer is c) Exterior Angle. Show moreβ¦
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