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You need to use a protractor.

You can also calculate it from the length of the three sides of a triangle it would make. Since an obtuse angle lies between 90 and 180 degrees just draw a line bisecting the two angle lines and measure the length of each of the three resulting sides.

View Wikipedia in the related link below to find out how to use trigonometry to accomplish this.

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15y ago

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Q: How do you measure an obtuse angle?
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