1. Dois angulos correspondentes, de- terminados por duas retas paralelas,
interceptadas por uma transversal,
medem 2x + 40° e -3x + 90°
a) Determine o valor de x.

b) Determine a medida de cada um dos
ângulos dados.​

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?