Welcome to "Croissant Angle Sum", a 4th Grade Angle Sums mission at the Challenger (stretch) level, staged in our bakery scenario. The mission opens with a hands-on prompt: "The whole angle is 180° and one part is 101°. Rotate the orange ray to show the unknown part." You'll work with the numbers 180, 101 and arrive at a final answer of 79 across 3 guided steps.
Behind the bakery story, this lesson is really about angle sums aligned to CCSS 4.MD.C.7. Recognize angle measure as additive. The key strategy this mission asks you to internalise: Unknown = 79°.
A general pattern to watch for in 4th Grade angle sums — illustrated with example numbers below, which may differ from this lesson's: Adding non-adjacent angles as if they shared a ray. Only adjacent angles (those sharing a ray) add directly. Otherwise, build up from the parts you know. If you get stuck on "Croissant Angle Sum", the adaptive Socratic hints below escalate from a gentle nudge to a worked-out strategy — the same way a one-on-one tutor would coach you through it.
Grade 4 · Anglesum
Mission Progress
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Thinking Summary · 1
Mastered[object Object]
[Discovery] The whole angle is 180° and one part is 101°. Rotate the orange ray to show the unknown part.
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Active StepRotate the orange ray to align with the blue target at 79°.
