Let's work through the questions from the image you uploaded.

Question 1: Tentukan panjang sisi AB pada tiap bangun berikut (Find the length of side AB in the following shapes)

a) For the first shape (right triangle):

• Sides: AC = 6 cm (base), BC = 15 cm (hypotenuse), height from C to AB = 10 cm
• Use the Pythagorean theorem to find AB. $AB^2 = AC^2 + BC^2 = 6^2 + 10^2 = 36 + 100 = 136$ $AB = \sqrt{136} \approx 11.66 \, \text{cm}$

b) For the second shape (triangle):

• Given: AE = 12 cm (height), AB = 20 cm (hypotenuse), BE = 12 cm (vertical height), CE = 15 cm
• Again using the Pythagorean theorem, solve for AB. $AB = \sqrt{AE^2 + BE^2}$ which gives