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| Part 1: Presenting and Checking Warm-Up Problems [Begin: 00:01]
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The teacher begins by presenting four situations, all drawn on the chalkboard. Each contains intersecting lines and rays that create vertical and supplementary angles. Students are asked to find the measures for ten angles. The teacher helps find four of the angles by asking questions and providing information. Then he asks students to find the rest. After about 40 seconds, the teacher works through the remaining problems in a similar way, by eliciting responses from students using questions such as "If this angle is a right angle and this is thirty degrees, what does F have to be?... And what’s left for angle E?... They all have to add up to...?" The warm-up activity lasts for about five minutes. | ||
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