Early in his career, Andrew Ellicott Douglass (1867-1962) noticed a connection between climate and the growth of plants. Studying this connection, Douglass was able to develop the science of dendochronology, a method for dating events and climate variations by studying the growth rings of trees and ancient wood.

Question

Early in his career, Andrew Ellicott Douglass (1867-1962) noticed a connection between climate and the growth of plants. Studying this connection, Douglass was able to develop the science of dendochronology, a method for dating events and climate variations by studying the growth rings of trees and ancient wood. 
The concentric circles, or growth rings, represent the cross-section of a tree with a diameter of 16 centimeters. The width of the outer tree ring measures 2 centimeters. What is the area in square centimeters of the outer ring of the cross-section of the tree? Use 3.14 for .

bobpursley · Answer

The entire area of the tree is PI*16^2 The area inside the ring is PI*14^2 The difference is the area of the ring.

Marcos · Answer

114 cm.

Adithya · Answer

area of outer circle A1=Pi*16^2= 803.84 area of inner circle A2=Pi*14^2= 615.44 area of outer ring=A1-A2=188.4 cm

Cat · Answer

87.92 cm2 =D