1. There once lived a little deer in the forest. He had beautiftd antlers. So he used to be proud of them. But when he saw his ugly(丑陋的) legs,he was very sad.
Here is a right angled triangle.The two shorter sides are three and fourunits long.How many units long is the longest side?Can you tell without measuring?How?About 2500 years ago(500 B. C.)a great Greek,
文摘1. There once lived a little deer in the forest. He had beautiftd antlers. So he used to be proud of them. But when he saw his ugly(丑陋的) legs,he was very sad.
文摘Here is a right angled triangle.The two shorter sides are three and fourunits long.How many units long is the longest side?Can you tell without measuring?How?About 2500 years ago(500 B. C.)a great Greek,