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Math / Measurement / Grade 4 / me4ba

Find a Missing Straight Angle - Practice 1

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 25 degrees. How many degrees is the other?
Question 2 Two adjacent angles make a straight angle. One is 35 degrees. How many degrees is the other?
Question 3 Two adjacent angles make a straight angle. One is 45 degrees. How many degrees is the other?
Question 4 Two adjacent angles make a straight angle. One is 55 degrees. How many degrees is the other?
Question 5 Two adjacent angles make a straight angle. One is 65 degrees. How many degrees is the other?