The vertices of AWIN are W(2, 1), I(4, 7), and N(8, 3). Using coordinate geometry, show AWIN is an isosceles triangle. y a. b. AWIN is not equilateral.

Determine whether the triangle with vertices P(1, 2, 2), Q(2,0,−1), R(5, 0, 0) is acute (has all angles < 90°) or not, and explain why.

3. Triangle ABC has vertices , and C(6,-5). Prove that triangle ABC is an isosceles right triangle. A(-2,1) B(5,2) y

Vertices of a triangle PQR have coordinates: P (2, 1, -1), Q (6, 4, 2) and R (5, 3, 1). Use the Dot product to find the angle at the vertex P. Draw the triangle and label the angle.