Missing angles with letters: straight lines, corners and crossing lines
Grade 8 Math Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
Noah opens craft scissors, and the blades cross. Two angles across from each other are (3x + 12)° and (5x − 20)°. Which equation fits the sketch?
- 3x + 12 = 5x − 20
- 3x + 12 + 5x − 20 = 90
- 3x + 12 + 5x − 20 = 180
Pia's ramp board rests on flat ground. The angles on each side of it are (2x + 30)° and (4x)°. Which equation fits the sketch?
- 2x + 30 = 4x
- 2x + 30 + 4x = 180
- 2x + 30 + 4x = 90
Ren sews a straight seam out from the square corner of a quilt patch, splitting it into (x + 15)° and (2x)°. Which equation fits the sketch?
- x + 15 + 2x = 90
- x + 15 + 2x = 180
- x + 15 = 2x
Tala draws two straight paths crossing on paper. Two angles across from each other are (4x − 10)° and (2x + 30)°. Which equation fits the sketch?
- 4x − 10 + 2x + 30 = 90
- 4x − 10 = 2x + 30
- 4x − 10 + 2x + 30 = 180
Ari solved an angle equation and found x = 31. In the sketch, the kite string's angle is (4x + 6)°. How many degrees is it?
Esme solved an angle equation and found x = 29. In the sketch, the scissors' angle is (2x + 37)°. How many degrees is it?
Jun's ramp board rests on flat ground. The angles on its two sides are (2x + 16)° and (3x + 9)°. The sketch writes 180° along the ground. What is x?
A straight crack runs out from the square corner of Kira's window pane, making angles of (x + 12)° and (2x + 6)°. The sketch writes 90°. What is x?
Luz's bike kickstand touches flat ground, making angles of (4x + 7)° and (x + 8)° on each side. The sketch writes 180°. What is x?
Milo folds the square corner of a paper sheet, splitting it into (3x − 6)° and (x + 4)°. The sketch writes 90° in the corner. What is x?