Which of these rectangles has the same area as the triangle? Choose all the correct answers. A a 10 cm -by-18 cm rectangle B a 6 cm -by-12 cm rectangle C a 6 cm -by- 10 cm rectangle 72 D a 5 cm -by- 12 cm rectangle E a 6 cm -by- 6 cm rectangle

Si el perímetro de un círculo es \( 10 \pi \mathrm{~cm} \). ¿cuál es el área de su semicirculo?

9. In the given figure \( D L \) and \( B M \) are the heights corresponding to sides \( A B \) and \( A D \) respectively of parallelogram \( A B C D \). If the area of parallelogram is \( 300 \mathrm{~cm}^{2}, A B=30 \mathrm{~cm} \) and \( A D=20 \mathrm{~cm} \). Find the length of \( B M \) and \( D L \).

14. Find the radius of a hemisphere of volume \( 80 \mathrm{~cm}^{3} \)

1. \( \triangle A B C \) is right angled at \( A \). \( A D \) is perpendicular to \( B C \). If \( A B=8 \mathrm{~cm}, B C=10 \mathrm{~cm} \) and \( A C=6 \mathrm{~cm} \). Find the area of \( \triangle A B C \). Also, find the length of \( A D \).

3.4.1 What type is triangle \( A B C \) ?