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Math / Measurement / Grade 4 / me4bb

Find a Missing Straight Angle - Practice 2

A straight angle measures 180 degrees.

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A straight angle measures 180 degrees. If two adjacent angles fill a straight angle, subtract the known measure from 180.

Worked example

An angle of 65 degrees beside an unknown angle on a straight line leaves 180 - 65 = 115 degrees.

An angle of 65 degrees beside an unknown angle on a straight line leaves 180 - 65 = 115 degrees.
Worked model: An angle of 65 degrees beside an unknown angle on a straight line leaves 180 - 65 = 115 degrees.
Question 1 Two adjacent angles make a straight angle. One is 75 degrees. How many degrees is the other?
Question 2 Two adjacent angles make a straight angle. One is 85 degrees. How many degrees is the other?
Question 3 Two adjacent angles make a straight angle. One is 95 degrees. How many degrees is the other?
Question 4 Two adjacent angles make a straight angle. One is 105 degrees. How many degrees is the other?
Question 5 Two adjacent angles make a straight angle. One is 115 degrees. How many degrees is the other?