Two window washers, Samir and Becky, lean a ladder against the side of a building so that Samir can wash a window while Becky holds the ladder. The top of the ladder reaches the
window, which is 3 meters off the ground. The base of the ladder is 4 meters away from the
building. How long is the ladder?

5 meters.

Step-by-step explanation:

The side of the building and the ground makes an angle of 90°. This means that we don't need to use sine or cosine law to find for the other side.

We can just simply use the Pythagorean Theorem which is

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.