... =xx yy 21 2 21 2 − +()()-The distance between ( 3, 2) and (5, –1) is−− + +3+ 935 8 64 73 2 2 22 ()=() ()= =2- -1 -B. The midpoint of a line segment =xxyy 121 2 22 ++,Since ... square = s 2 = 36 Therefore, s = 6 and perimeter = 24 Geometry 20 5www.petersons.com 3. RIGHT TRIANGLESA. Pythagorean theorem(leg) 2 + (leg) 2 = (hypotenuse) 2 52 25 4 29 29 22 2 2 2 () ()====++xxxxB. ... acutetriangle. 2. (B) The area of a circle is πr 2 . The area of acircle with radius x is πx 2 , which equals 4.The area of a circle with radius 3x is π (3x) 2 = 9πx 2 = 9 · 4 = 36 . 3. (D) 23 49 13 13 22 ...