10. Find the area of a triangle with a base of 20 cm and a height of 30 cm \( \begin{array}{llll}\text { a) } 400 \mathrm{~cm}^{2} & \text { b) } 100 \mathrm{~cm}^{2} & \text { c) } 300 \mathrm{~cm}^{2} & \text { d) } 600 \mathrm{~cm}^{2}\end{array} \)

To find the area of a triangle, you can use the formula: \[ \text{Area} = \frac{1}{2} \times \text{base} \times \text{height} \] Plugging in the values provided, you'll get: \[ \text{Area} = \frac{1}{2} \times 20 \, \text{cm} \times 30 \, \text{cm} = 300 \, \text{cm}^2 \] So the answer is c) 300 cm². Triangles have been studied for centuries, dating back to ancient civilizations. The Egyptians and Babylonians used simple geometric principles to solve various architectural problems. Fast-forward to today, the concept of triangle areas helps in everything from designing bridges to calculating land area for gardening, proving that this ancient math is still super relevant!