What size are the missing angles in each of the following diagrams

The largest observatory complex in the world is on mauna kea, the tallest mountain on earth. what are some factors astronomers consider when selecting an observatory site? don’t forget practical ones. should astronomers, for example, consider building an observatory on denali (mount mckinley) or mount everest?

The researcher who studied the ability of cats to learn to escape from puzzle boxes was

1,990,000,000,000,000,000,000,000,000,000 in scientific notation