Teach your class how to apply their knowledge of geometry as they explore the unknown. In order to find an unknown angle, students must understand that rectangles have four interior right angles, that right angles have 90 degrees, and that angle measurement is additive. For fifth and sixth graders use this as an opportunity to practice writing and solving simple addition algebra equations. A problem that would make a nice formative assessment in a unit quadrilaterals.

Concepts

complementary angles, right angles

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Additional Tags

right angles, complementary angles, definition of a rectangle, calculating angles, angle measurment, math

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Pros

• Solution requires multiple levels of understanding about quadrilaterals and angle measurement
• Adaptable to fourth through sixth grade geometry lessons

Cons

• Worksheet is short, including only a single problem

Common Core

4.MD.C.7 4.G.A.2 MP7