Area = 1/2*base*perpendicular height
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you split your shape in half, (The rectangle and the triangle), by putting a line through it and then calculate the area of the rectangle and then calculate the area of the triangle, half the area of the triangle then add the area of the triangle and the rectangle together!Then you should have your answer!
If you want to figure out just the area of the triangle, the formula is base times height divided by 2. It does not matter if it is inside a square, as long as you have the legnths of all they sides you need to calculate the area of that triangle. If you do not, It would be very difficult.
Area of Equilateral Triangle A= S2 * (Root 3)/4, where A= Area of the triangle S= Side of the triangle.
To calculate the area of a triangle, you use the formula: Area = 0.5 x base x height. Plugging in the values given, the area of the triangle would be 0.5 x 18cm x 20cm = 180 square centimeters.
The are of any triangle is calculated by the formula: Area = 1/2 x Base x Height