10. The length of each part of the ladder is equal to 2.5 m. The ladder is spread out at an angle of 50 ° . Determine how high the top of the ladder is above the ground. Give your answer to the nearest 0.1 m. 11. A hot air balloon hangs at a height of 70 m above the ground surface. From the top of the balloon tower (point D) seen at an angle of 15" from the horizon, o the entire tower AD is seen at an angle of 25". Approx calculate the distance AB (to the nearest 1 m) ​