Measure the three lengths and add them together to find out the perimeter. adding its three sides
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To find the area of a triangle, you have to multiply the base of the triangle and the height of the triangle, then divide the product of those numbers by two.
To find the height of a triangle you measure it. It has to be from the middle of the base to the top point.
You look at the lengths of the sided of the triangle. If the two lengths are same, the triangle is an isosceles triangle. If all the lengths are same, the triangle is an equilateral triangle. If none of the lengths are same, the triangle is a scalene triangle.
The triangle's altitude is 8.7 (8.66025) cm.
Use either the Sine or Cosine rules depending on the information you know about the triangle.