- A80°
- B40°
- C60°
- D100°
Step-by-Step Solution
Angles of a triangle add to . The angles are ; the largest, , is . (Forgetting the 20 gives or, adding it, and the wrong )
Answer: A) 80°
The angles of triangle PQR are marked in terms of . What is the size of the largest angle?
Class 7Simple EquationsSimple Equations
Key idea: Two-sided equations: variable on both sides
When the variable appears on both sides, gather all variable terms on one side and all constants on the other.
Example: .
Move to the left (flip):
Simplify:
Move +3:
Divide: .
**Verify**: ; ✓.
Example: .
Move to the left (flip):
Simplify:
Move +3:
Divide: .
**Verify**: ; ✓.
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