Suppose that A B ⇀ , A C ⇀ , A D ⇀ , A E ⇀ , and A F ⇀ are coplanar, Exercises 1 0 - 1 3 Classify the following as true or false: a) m ∠ B A C + m ∠ C A D = m ∠ B A D b) ∠ B A C ≅ ∠ C A D c) m ∠ B A E − m ∠ D A E = m ∠ B A C d) ∠ B A C and ∠ D A E are adjacent e) m ∠ B A C + m ∠ C A D + m ∠ D A E = m ∠ B A E
Suppose that A B ⇀ , A C ⇀ , A D ⇀ , A E ⇀ , and A F ⇀ are coplanar, Exercises 1 0 - 1 3 Classify the following as true or false: a) m ∠ B A C + m ∠ C A D = m ∠ B A D b) ∠ B A C ≅ ∠ C A D c) m ∠ B A E − m ∠ D A E = m ∠ B A C d) ∠ B A C and ∠ D A E are adjacent e) m ∠ B A C + m ∠ C A D + m ∠ D A E = m ∠ B A E
Use the figure to answer the following questions by YES or NO.
1. Are E, I, and A coplanar?
2. Are E, I, M, A coplanar?
The diagonals of an isosceles trapezoid ABΓΔ (ΑΒ // ΓΔ) intersect at O. If E, Z, H, Θ are the means of OA, OB, OΓ, OΔ, respectively, prove that ΕΖΗΘ is an isosceles trapezoid.
Use the figure to answer the following questions by YES or NO.
1. Are line segment EA and line segment ED coplanar?
2. Are line segment EA, line segment ED, and line segment AD coplanar?
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