Which properties belong to all isosceles triangles? check all that apply.
the base angles are congruent.
all three angles are congruent.
the two sides opposite the base angles are congruent.
all three sides are congruent.
the bisector of the vertex angle is the perpendicular bisector of the base.

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2

there is no grid

step-by-step explanation: