bạn cho mình xinh công thức tính được không
chỗ kia phải là SCA^=45o" role="presentation" style="font-family: 'Open Sans', sans-serif; display: inline; line-height: normal; font-size: 14.6667px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">SCAˆ=45oSCA^=45o mới đúng.
ta tính được CB=33;BA=3" role="presentation" style="font-family: 'Open Sans', sans-serif; display: inline; line-height: normal; font-size: 14.6667px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">CB=33–√;BA=3CB=33;BA=3
tính được SA=AC=6" role="presentation" style="font-family: 'Open Sans', sans-serif; display: inline; line-height: normal; font-size: 14.6667px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">SA=AC=6SA=AC=6
thể tích khối chóp: V=13SA.12.AB.BC" role="presentation" style="font-family: 'Open Sans', sans-serif; display: inline; line-height: normal; font-size: 14.6667px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">V=13SA.12.AB.BC