I assume you mean the points (6,6), (2,2) and (4,0)
The answer is yes.
The line going (2,2) to (6,2) has length 4*sqrt(2) where * means multiply
The line going (4,0) to (6,6) has length 4*sqrt(2)
Since both lengths are the same, the triangle is isosceles.
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area of a triangle is half the base times the height .5*22*28=308
yes
The altitude to the base of an isosceles triangle bisects it forming two right angled triangles (which are congruent). In either of those right angled triangles, the altitude forms one leg and half the base of the original triangle forms the other. So, tan(26) = Alt/11 or Alt = 11*tan(26) inches = 5.365 inches.
14.667 It would be proportional to the base of the first triangle. Find it by setting up a proportion: 18/22 = 12/x Cross multiply and solve for x. 18x = 264 x = about 14.67 cm
No. For a right angle triangle, the sum of the squares of the shorter sides equals the square of the longer side (the hypotenuse): 22 + 62 = 40 72 = 49