vector projections (2d)

diff --git a/spec/vectors.md b/spec/vectors.md
index 86bd95bdd938e773306387d1220121bafd20b496..f832af7f4eb6f0f3009dc2487daaf2e0e6ff190d 100644 (file)
--- a/spec/vectors.md
+++ b/spec/vectors.md
@@ -97,3 +97,7 @@ If $\vec{a} \cdot \vec{b} = 0$, then $\vec{a} \perp \vec{b}$ (since $\cos 90 = 0
 ## Finding angle between vectors
 
 $$\cos \theta = {{\vec{a} \cdot \vec{b}} \over {|\vec{a}| |\vec{b}|}} = {{a_1 b_1 + a_2 b_2} \over {|\vec{a}| |\vec{b}|}}$$
+
+
+## Vector projections
+