Find missing angles (straight line, corner, crossing lines)
Grade 7 Math Worksheet
Circle the best answer, or write your answer on the line.
Ari cuts a pizza with two straight cuts that cross. A short cut from the middle splits one angle into 44° and 39°. Angle x is across from that whole angle. What is x?
Jun swings the gym door open for the relay race. The angles on each side of the door are supplementary: 84° and (3x)°. What is x?
Kira folds the square corner of a paper for a paper-plane wing. The fold makes complementary angles of 34° and (2x)°. What is x?
At sunset a ray of light reaches the flat lake by Noah's tent. The angles on each side of the ray are 21° and x. What kind of angle pair are they?
- Vertical angles: they are equal, and sit across from each other
- Complementary angles: they add to 90°
- Supplementary angles: they add to 180°
Ren stands a pencil on a flat ruler for a wobbly science demo. The angles on each side of the pencil are 152° and x. What kind of angle pair are they?
- Vertical angles: they are equal
- Supplementary angles: they add to 180°
- Complementary angles: they add to 90°
Tala stitches a line out from the square corner of a quilt square. It splits the corner into 40° and (5x)°. Which equation finds x?
- 5x + 40 = 360
- 5x + 40 = 90
- 5x + 40 = 180
- 5x = 40
Zee's kite sticks cross like an X. The (x + 25)° angle is across from a 94° angle. Which equation finds x?
- x + 25 + 94 = 180
- x + 25 + 94 = 360
- x + 25 + 94 = 90
- x + 25 = 94
Ari draws a line out from the square corner of a birthday-card envelope. It splits the corner into 31° and (3x)°. Which equation finds x?
- 3x + 31 = 90
- 3x = 31
- 3x + 31 = 360
- 3x + 31 = 180
Luz paints three spokes of a bike wheel bright colors. The painted spokes make angles of 62°, 104° and x around the hub. What is x, in degrees?
Milo cuts a birthday cake into three pieces from the center. Two of the angles at the center are 118° and 47°. What is the third angle, x, in degrees?