Beth ydy'r digidau cyntaf sydd yn cael eu defnyddio i gynrychioli \(\pi\)?
\[{3.14}\]
\[{3.16}\]
\[{13.5}\]
Beth ydy'r fformiwla i ddarganfod cylchedd cylch?
\[\pi{d}\]
\[\pi{r}^{2}\]
\[{2}\pi{d}\]
Beth ydy'r fformiwla i ddarganfod arwynebedd cylch?
\[{2}\pi{r}\]
Beth ydy hyd cylchedd cylch sydd â diamedr o \({7}~{cm}\)?
\[{20.9}~{cm}~(i~1~ll.~d.)\]
\[{22.0}~{cm}~(i~1~ll.~d.)\]
\[{24.6}~{cm}~(i~1~ll.~d.)\]
Beth ydy hyd cylchedd cylch sydd â radiws o \({5}~{cm}\)?
\[{15.7}~{cm}~(i~1~ll.~d.)\]
\[{25.8}~{cm}~(i~1~ll.~d.)\]
\[{31.4}~{cm}~(i~1~ll.~d.)\]
Beth ydy hyd diamedr cylch sydd â chylchedd o \({15}~{cm}\)?
\[{4.6}~{cm}~(i~1~ll.~d.)\]
\[{4.7}~{cm}~(i~1~ll.~d.)\]
\[{4.8}~{cm}~(i~1~ll.~d.)\]
Beth ydy arwynebedd cylch sydd â radiws o \({4}~{cm}\)?
\[{50.3}~{cm}^{2}~(i~1~ll.~d.)\]
\[{50.8}~{cm}^{2}~(i~1~ll.~d.)\]
\[{51.3}~{cm}^{2}~(i~1~ll.~d.)\]
Beth ydy arwynebedd cylch sydd â diamedr o \({16}~{cm}\)?
\[{200.0}~{cm}^{2}~(i~1~ll.~d.)\]
\[{201.1}~{cm}^{2}~(i~1~ll.~d.)\]
\[{804.2}~{cm}^{2}~(i~1~ll.~d.)\]
Beth ydy arwynebedd hanner cylch sydd â radiws o \({10}~{cm}\)?
\[{157.1}~{cm}^{2}~(i~1~ll.~d.)\]
\[{314.2}~{cm}^{2}~(i~1~ll.~d.)\]
\[{412.5}~{cm}^{2}~(i~1~ll.~d.)\]
Beth yw hyd radiws cylch sydd ag arwynebedd o \({42}~{cm}^{2}\)?
\[{3.5}~{cm}~(i~1~ll.~d.)\]
\[{3.6}~{cm}~(i~1~ll.~d.)\]
\[{3.7}~{cm}~(i~1~ll.~d.)\]