Use Euler diagram to determine whether the argument is valid or invalid. 1. All frogs are poetical. Kermit is a frog. Therefore, Kermit is poetical. 2. No squares are triangles. Some triangles are...

Extracted text: Use Euler diagram to determine whether the argument is valid or invalid. 1. All frogs are poetical. Kermit is a frog. Therefore, Kermit is poetical. 2. No squares are triangles. Some triangles are equilateral. Therefore, no square is equilateral. 3. Some whales are good pets. Some good pets are cute. Some cute pets bite. Therefore, some whales bite.