50 likes | 202 Views
I can recognize the need for clarity &concision in proofs. I can understand the concept of perpendicularity. Day 2. 2.1: Perpendicularity. A (–4, 8). B (10, 8). 1. Find the area of the rectangle ABCD. 2. Find the coordinates of D.
E N D
I can recognize the need for clarity &concision in proofs. I can understand the concept of perpendicularity. Day 2 2.1: Perpendicularity A (–4, 8) B (10, 8) 1. Find the area of the rectangle ABCD. 2. Find the coordinates of D. 3. If the coordinates of point B are not given, could you answer the first two questions? D C (10, –2)
What is perpendicular? Definition: Lines, rays, or segments are perpendicular ( ) if they intersect at right angles (90o)
Example 1 • Given: ratio of ∠FIE to ∠RIE is 3:2 • Find: m∠FIE F E I R
Example 2 • Given: • Prove: D R W A
Example 3 • Given: COPY is a rectangle • Find: • The coordinates of C • The area of the rectangle O (6, 4) C P (6, -2) Y (-8, -2)