In the figure on the right, assume that the distance between adjacent dots in a row or column is 1 unit. Determine the area of the figure.

\( =11 \mathrm{~cm}^{2} \) Example 2 The area of a sector of a circle is 38.5 cm if the angle subtended at the centre is 90

4. \( A B C \) үшбұрышында \( B C \) биссектрисасы сызылған, \( A K=4 \) см және \( K S=5 \mathrm{~cm} A B C \) үшбұрышының периметрі 36 см AB және BC қабырғаларын табыңыз.

5. \( A B C \) гурвалжны \( A B=B C=8 \) см ба талбай нь \( s=16 \mathrm{~cm}^{2} \) бол өнцөг \( A B C= \) ?

4. Which of the following can be the sides of a right triangle? (i) \( 2.5 \mathrm{~cm}, 6.5 \mathrm{~cm}, 6 \mathrm{~cm} \). (iii) \( 2 \mathrm{~cm}, 2 \mathrm{~cm}, 5 \mathrm{~cm} \). (iii) \( 1.5 \mathrm{~cm}, 2 \mathrm{~cm}, 2.5 \mathrm{~cm} \).

5. A tree is broken at a height of 5 m from the ground and its top touches the ground at a distance of 12 m from the base of the tree. Find the original height of the tree.