Remember the conversion factor between metric and imperial .
2.54 cm = 1 inch.
Hence
2.54 cm = 25.4 mm = 1 inch.
There fore in 7 inches there are 7 x 25.4 = 177.8 mm
17.78 cm
7 in = 17.78 cm
90cm: 90cm(1 inch/2.54cm)=35.43inches (1ft/12inches)=2.95ft 7inches: 7inches (1ft/12inches)=0.58ft 8cm: 8cm (1inch/2.54cm)=3.15inches (1ft/12inches)=0.26ft Therefore: 2.95ft + 0.58ft + 0.26ft = 3.79ft
200.66 centimeters.
127 inches.
17.78 cm
67
7 in = 17.78 cm
151 inches
5 ft 7 incehes = 1.70 metres.
103, there are 12 inches in one foot
90cm: 90cm(1 inch/2.54cm)=35.43inches (1ft/12inches)=2.95ft 7inches: 7inches (1ft/12inches)=0.58ft 8cm: 8cm (1inch/2.54cm)=3.15inches (1ft/12inches)=0.26ft Therefore: 2.95ft + 0.58ft + 0.26ft = 3.79ft
19 inches
5ft 7inches
200.66 centimeters.
7" = 17.8 cm
Remember and commit to memory. C = 2 pi r or C = pi d A = pi r^(2) Where C = Circumference A = Area pi is a constant at 3.1416 r = is the radius d is the dianter ; 2r = d r^(2) = r x r = 'r' squared. So selecting r = 7 inches Then C = 2* (3.1416)* 7 C = 14*3.1416 C = 43.98229.... C ~ 43.99 inches. NB In school you may be given pi = pi = 3.14, 3.1416, 22/7 These are only approximations, but given for ease of calculating. pi = 3.141592.... Is an irrational number and the decimals recur to infinity, AND are in no regular numerical order.