I don't see any isosceles triangle below.In general, the perimeter is the sum of the lengths of all sides. Note that in an isosceles triangle, two of the three sides have the same length.
Area of equilateral triangle: 0.5*12*12*sin(60 degrees) = 187 square cm
The perimeter just means the length of something all the way round. So to find the perimeter of a triangle, you have to add the three sides together. That's it.
Find the area of an equilateral triangle that has a perimeter of 21 inches. Round the answer to one decimal place.
the answer is 32
77 in
Sorry wrong question
33
The perimeter is 2 times the length plus 2 times the width.
They dumped the Arched Window for a Triangle Window. When for 20 Years The Windows Order was Square, Arched ,Round, Then it Became Square,Triangle, Round, Knowing That ABC Tv made a Mistake and that Square, Triangle, Round Didn't Belong and how it had been Square, Arched, Round for 20 Years. They Changed it Back to the Familiar Square, Arched, Round Windows Format in Mid 1987.
17.2 in
Area of equilateral triangle: 0.5*7*7*sin(60 degrees) = 21.2 square inches