Angle Sum Property of a Triangle MCQs
Practice Angle Sum Property of a Triangle multiple-choice questions from Lines and Angles (Class 9 Maths) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Angle Sum Property of a TriangleQuiz - Solve & Score
Q1. A surveyor maps a triangular plot of farmland and records the angles at two corners as 25 degrees and 120 degrees; what is the angle at the remaining corner?
- A.145 degrees
- B.215 degrees
- C.95 degrees
- D.35 degrees
Answer: D. 35 degrees
All three angles of a triangle add to 180 degrees. The two given are 25 and 120 (sum 145), so the third = 180 - 145 = 35 degrees.
Q2. An architect sketches a triangular skylight panel whose two interior angles measure 50 degrees and 115 degrees; what does the third interior angle equal?
- A.165 degrees
- B.65 degrees
- C.195 degrees
- D.15 degrees
Answer: D. 15 degrees
All three angles of a triangle add to 180 degrees. The two given are 50 and 115 (sum 165), so the third = 180 - 165 = 15 degrees.
Q3. While cutting a triangular sail, a tailor measures two corner angles as 40 degrees and 80 degrees; what is the third corner angle?
- A.40 degrees
- B.240 degrees
- C.60 degrees
- D.120 degrees
Answer: C. 60 degrees
All three angles of a triangle add to 180 degrees. The two given are 40 and 80 (sum 120), so the third = 180 - 120 = 60 degrees.
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