Roger has a nail that is 12 centimeters long. he measures and records the length of the nail as 15 centimeters. what is the percent error in roger's measurement?

The empire state building in new york city is 1454 feet tall a model of a building is 24 inches tall what is the ratio of the height of the model to the height of the actual empire state building

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota