In peru's manu rainforest visitors can see a. inca ruins b. many species of birds and other animals c. huge sand figures

b. many species of birds and other animals

Explanation:

Peru is country in the western South America and is bordered by the north equator and Colombia and Peru is a country that ha a mega biodiversity of habitats of regions that ranges arid plains and the country has tropical amazon rain forest basin and due to its climate,  21,462 species of plants and animals and about 2003, and 5,855 species are endemic to the region.

Simply multiply pi by the diameter