∠a is 35° because of vertical angle congruence. ∠b is 55° because one angle is right, so the other two have to add up to 90°, and 90°-35°=55°. ∠c is 110° because it creates a straight angle (180°) with the 70° angle, and 180°-70°=110°.
Answer:
102
Step-by-step explanation:
All angles added together=180
180-13-65
180-78
102
Answer:
Step-by-step explanation:
Hence, the surface area of a triangular pyramid is 140 square units.
Rectangle = 9*5=45
Triangle= 1/2 * 10 * 3 = 15
Add the two shapes: 45+15 = 60 sq units