I find the easiest way is to split the triangle into to right angles.
This will only work if you know the length of the base or if you can find another part of your two new triangles using trigonometric or Pythagoras functions.
Find the areas of the rectangles and triangles. Add them together.
Divide the polygon into triangles. Calculate the areas of the triangles and then sum these.
The only general way is to divide the pentagon into three triangles, calculate the areas of the triangles and add them together.
Add the areas of the 4 triangles on the side of the pyramids As the 4 triangles are the same, just find the area of one of them and multiply by 4
You would need to divide it into triangles, find the area of each triangle and sum these areas together.
If you draw your triangles using the centre of the circle as one vertex and two more on the circumference, the area of the circle is approximately equal to the sum of the areas of the triangles; the smaller you make the triangles, the more accurate your result will be.
no triangles
One method is to divide it into regular shapes - rectangles, triangles, etc. - and measure the areas of those shapes.
You will need to divide it up into regular shapes whose areas you can calculate using formulae. Triangles are easiest.
Join a pair of opposite corners so that you have two triangles and then use Heron's formula to find the area of the two triangles. Add these areas together.
Find out the number of matchsticks that the learners would need to build 40 triangles
Breaking a figure into triangles and rectangles means dividing a complex shape into simpler geometric components that are easier to analyze or calculate. Triangles and rectangles are chosen because their areas and properties can be easily determined using basic formulas. This technique is often used in geometry and calculus to simplify calculations involving area, perimeter, or other characteristics of the original figure. By summing the areas of the resulting triangles and rectangles, you can find the total area of the complex shape.