Is the triangle ABC with vertices A(3, 2, -1), B(6.3.0) and C(-3, 1, 4) acute, right or obtuse? Note You need to do this without explicitely calculating the angles.

If D is the triangle with vertices (0,0), (82,0), (82,37), then dA=

Determine the area (in square units) of AABC if A = (5, 1), B = (8, 3), and C is the reflection of B across the x-axis. units?

Find the area of a triangle PQR, where P = (6, -5, - 4), Q = (– 5, 2, 6), and R = (4, 5, — 1)

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.

True or False The circumcenter of the right triangle is that the vertex of the right angle.

ABC is right-angle triangle, right -angled at A. The coordinates of B and C are (6,4) and (14,10) respectively. The angle between the side AB and x-axis is 45° Find the coordinates of A.

L, A Click Submit to complete this assessment. Question 10 Find the are of the triangle wth vertices P(2,1,3), Q(-1,2,-1) and R (1,-1,1). OA. V150 2. O B. 152 2. O C.No one correct. OD. 153 O E. 151 A Click Submit to complete this assessment. 2.

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.

Classify the triangle with vertices A(2,1), B(4,5) and C(6,1) as isosceles or equilateral. Use distance formula to justify your answer. Round answers to tenths if needed. Side AB has length , side BC has length , side AC has length These side lengths support the fact that triangle ABC is