What process consists of a logical chain of steps that show that a statement must be true

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

How much orange juice do you need to make 2 servings of lemony orange slush?

Write an introductory paragraph for this corrie ten boom and her family were faced with some difficult choices after hitler came to power. some family members paid the ultimate price. write a carefully thought-out paper of at least 200 words dealing with the following concepts: --how should a christian act when evil is in power? --what do you think it would be like to live in an occupied country? remember to proofread anything you write thoroughly.