Answer: subtract the part inserted into the mud and the part exposed from the water surface from the total length of bamboo poles to get the depth of the pool water.
4.3-0.3- 1. 1,
=4- 1. 1,
=2.9 (m);
A: The depth of the swimming pool is 2.9 meters.
Junior high school question: Xiao Cong is going to measure the depth of a pool. He found a long bamboo pole and inserted it at the bottom of the water 1.5m from the shore. The exposed part of the bamboo pole is1.5m. When he pulls the top of the bamboo pole to the shore, he finds that the exposed part of the bamboo pole is 1m, so the depth of the pool is ().
2 million high, 2.5 million low, 2.25 million high and 3 million deep.
Answer: (pictured)
Let the water depth be xm,
∫ The part of bamboo pole above the water surface is 1.5m,
∴ The height of bamboo pole is: x+ 1.5 (m),
Because the part of the bamboo pole in the water is just a right triangle with the edge of the pool,
∴ab=x+ 1.5- 1,ac=x,bc= 1.5，
From Pythagorean Theorem
AC2+BC2=AB2, namely x2+1.52 = (x+1.5-1) 2,
The solution is x = 2m.
So choose a.