5 cm 3 cm
Which face has an area of 28 cm2?
5 cm
3 cm
Face
4 cm
7 cm
А
B
с
7 cm
E

Face B has an area of 28 cm2

Step-by-step explanation:

Area of a Rectangle

Given a rectangle with dimensions X and Y, the area of the rectangle is calculated as:

A=X*Y

Area of a Triangle

Given a triangle with dimensions X and Y, the area of the triangle is calculated as:

We need to find the face of the figure with an area of 28 cm2. A quick look can give us the solution since we only need to find a shape of dimensions 7 and 4. Face B is the only one to have an area of 28 cm2. Let's try them all:

Face A: Rectangle of dimensions 5 cm, 7 cm. Area=5*7=35 cm2. Incorrect

Face B: Rectangle of dimensions 4 cm, 7 cm. Area=4*7=28 cm2. Correct

Face C: Rectangle of dimensions 3 cm, 7 cm. Area=3*7=21 cm2. Incorrect

Face D: Triangle of dimensions 3 cm, 4 cm. Area=3*4/2=6 cm2. Incorrect

Face E: Apparently a triangle congruent to face D. If so, Incorrect

Face B has an area of 28 cm2

C is the correct answer. The mariner realizes that he was not being chased but that he led the chase and he finally stops when the animal passes. He passes as well, wandering alone on the sea.