Perimeter of ABC = 30+40+60=130. Because for XYZ all sides r-times as long as corresponding sides of ABC, Perimeter of XYZ = 30r+40r+60r=130r.
Answer is B. 130r.
Area of triangle ABC =1/2 base*height. For XYZ all linear measurements is increased by r, so Area of triangle XYZ =1/2( base*r)*(height*r)=1/2base*height*r*r= =Area(ABC)*r*r = n*(r*r)
Answer is C. n(r*r).
