Triangular Prism - Volume, Surface Area, Base and Lateral Area Formula, Basic Geometry

Sarah marie on Instagram: "My grandma’s oatmeal cake! A recipe she would make during the holidays and winter months! Ingredients for the cake: 1 cup quick Quaker Oats 1 & 1/2 cups boiling water 1/2 cup unsalted butter 1 cup packed dark brown sugar 1 cup granulated sugar 2 large eggs 1 & 1/2 cups all purpose flour 1 tsp cinnamon 1 tsp baking soda 1/2 tsp salt 1/2 tsp vanilla extract or vanilla bean paste For the topping: 1/2 cup unsalted butter 1/2 cup packed dark brown sugar 1/2 cup heavy cream