Success Criteria:  I can describe angles  I can measure angles and then describe angles Warm Up Today 1. Do Now 2.Check HW #2 3.Midpoints (1.3) 4.Vocab.

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Presentation transcript:

Success Criteria:  I can describe angles  I can measure angles and then describe angles Warm Up Today 1. Do Now 2.Check HW #2 3.Midpoints (1.3) 4.Vocab Ch Complete iReady 1. Draw AB and AC, where A, B, and C are noncollinear. 2. Draw opposite rays DE and DF. E F D C B A Possible answer:

Success Criteria:  I can describe angles  I can measure angles and then describe angles Today 1. Do Now 2. Vocab Ch Complete iReady Warm Up: Solve 1. 2x x – 4 + 3x – 5 = x + 2 = 8x –

An angle is a figure formed by two rays, or sides, with a common endpoint called the vertex (plural: vertices). You can name an angle several ways: 1. by its vertex, 2.by a point on each ray and the vertex, or 3. by a number.

The set of all points between the sides of the angle is the interior of an angle. The exterior of an angle is the set of all points outside the angle. Angle Name R, SRT, TRS, or 1

1.In your notebook draw 3 angles using a straight edge. 2.Use the protractor from the box and measure the angles.

Congruent angles are angles that have the same measure. In the diagram, mABC = mDEF, so you can write ABC  DEF.

Example 1 How many angles do you see? Write the different ways you can name the angles in the diagram. RTQ, QTS, STR, 1, 2

Find the measure of each angle. Then classify each as acute, right, or obtuse. Example 2 A. WXV B. ZXW mWXV = 30° WXV is acute. mZXW = |130° - 30°| = 100° ZXW = is obtuse.

mDEG = 115°, and mDEF = 48°. Find mFEG Example 3 mDEG = mDEF + mFEG 115 = 48 + mFEG 67 = mFEG  Add. Post. Substitute the given values. Subtract 48 from both sides. Simplify. –48°

Example 4 mXWZ = 121° and mXWY = 59°. Find mYWZ. mYWZ = mXWZ – mXWY mYWZ = 121 – 59 mYWZ = 62  Add. Post. Substitute the given values. Subtract.

Solve with you’re a/b partner, then share with table Classify each angle as acute, right, or obtuse. 1. XTS 2. WTU acute right

Solve with you’re a/b partner, then share with table Classify each angle as acute, right, or obtuse. 3. K is in the interior of LMN, mLMK =52°, and mKMN = 12°. Find mLMN. 64° 4. mWYZ = (2x – 5)° and mXYW = (3x + 10)°. Find the value of x. 35

Assignment #3 pg 31 #7- 29 odds, all