# Solve Problems for Unknown Angles

Videos and solutions to help Grade 4 students learn how to use the addition of adjacent angle measures to solve problems
using a symbol for the unknown angle measure.

Common Core Standards: 4.MD.7

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Common Core For Grade 4
## New York State Common Core Math Module 4, Grade 4, Lesson 11

NYS Math Module 4 Grade 4 Lesson 11 Concept Development
Problem 1: Decompose a 360° angle into smaller angles. Recognize that the smaller angles add up to 360°.

Problem 2: Given two intersecting lines and the measurement of one angle, determine the measurement of
the other three angles.

NYS Math Module 4 Grade 4 Lesson 11 Problem Set
Terms for Angles: Vertical Angles, Supplementary Angles, Complementary Angles

NYS Math Module 4 Grade 4 Lesson 11 Problem Set
Write an equation and solve for the unknown angle measurements numerically.
Questions 1 - 2

Lesson 11 Problem Set
Question 3

Lesson 11 Problem Set
Question 4

Lesson 11 Problem Set
Write an equation and solve for the unknown angles numerically.

5. is the intersection of AB and CD.

∠DOA is 160° and ∠AOC is 20°

Lesson 11 Problem Set
6. O is the intersection of RS and TV.

∠TOS is 125°.

NYS Math Module 4 Grade 4 Lesson 11 Homework
Write an equation and solve for the unknown angle measurements numerically.

Question 3.
5. O is the intersection of AB and CD. ∠COB is 145° and ∠AOC is 35°. Find e° and f°.
7. O is the intersection of UV, WX and YO. ∠VOX is 46°. Find j°, k° and m°.