What is the perimeter of the isosceles triangle shown below?
A. 24 units
B. 18 units
C. 21 units
D. 12 units

B. 18 units

Step-by-step explanation:

The triangle can be divided into two right angle triangles whose height is 3 units and the upper width is 4 units.

Using pythagora's theorem to find the slant side (hypotenus) of each right angle triangle

y^2 = 4^2 + 3^2 = 25

y = 5 units.

The total width of the upper side of the triangle is 8 units,

The perimeter is the addition of all the sides of the triangle which is;

8 units + 5 units + 5 units = 18 units

See image below

false

step-by-step explanation:

false.   two legs of the trapezoid would be congruent, but the other two would not.   were all the legs congruent, then we'd have a square; were the 2 shorter sides congruent and the 2 longer sides also congruent, we'd have a rectangle.

this is false ^.^ lol