Decomposing angles (Full video)

Khan Academy

Supporting grades: 4

Description: Lindsay finds the measure of angle using addition. So we have this symbol here, which means angle, and then these three letters, EAC. Now to measure angle EAC, we need to first find angle EAC down here on our picture, and the way we can do that is use these three letters and we're gonna go in the order that they're given to us. The most common way to measure an angle would be to use a protractor, but we're not given a protractor, so we can't do that, but we do have enough information on this diagram down here to solve this.

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