Let’s solve each triangle step by step.
Remember:
→ In any triangle, the three angles add up to
180°.
→ If there’s a right angle (marked with a square), that angle is
90°.
→ So if you know two angles, subtract them from 180° to find the missing one.
→ Or if it’s a right triangle and you know one other angle, just do:
Missing angle = 90° - known acute angle
---
Problem 1:
Triangle has angles: 90°, 45°, and a°
So: a = 180 - 90 - 45 =
45°
Problem 2:
Triangle has angles: 90°, 40°, and d°
d = 180 - 90 - 40 =
50°
Problem 3:
Triangle has angles: 90°, 61°, and b°
b = 180 - 90 - 61 =
29°
Problem 4:
Triangle has angles: 90°, 48°, and x°
x = 180 - 90 - 48 =
42°
Problem 5:
Triangle has angles: 90°, 37°, and y°
y = 180 - 90 - 37 =
53°
Problem 6:
Triangle has angles: 90°, 62°, and n°
n = 180 - 90 - 62 =
28°
Problem 7:
Triangle has angles: 90°, 15°, and m°
m = 180 - 90 - 15 =
75°
Problem 8:
Triangle has angles: 90°, 46°, and t°
t = 180 - 90 - 46 =
44°
All calculations checked — they’re correct!
Final Answer:
1) a = 45°
2) d = 50°
3) b = 29°
4) x = 42°
5) y = 53°
6) n = 28°
7) m = 75°
8) t = 44°
Parent Tip: Review the logic above to help your child master the concept of missing angle worksheet.
